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Tang H.-X.,Harbin Normal University | Tang H.-X.,Suihua University | Lu S.-C.,Harbin Normal University
Wuli Xuebao/Acta Physica Sinica | Year: 2011

The SrMoO4:Eu3+ red phosphors that can be excited effectively by the ultraviolet, near ultraviolet and blue light emitting diode (LED) were prepared by chemical coprecipitation. The crystal structure and luminescent properties of the SrMoO4:Eu3+ phosphors were investigated. The X-ray diffraction patterns showed that the SrMoO4:Eu3+ synthesized by the process was a pure phase with tetragonal structure. The excitation spectrum of the SrMoO4:Eu3+ red phosphors consisted of a broad band peak and a series of sharp peaks, and since the strong peaks were located at 280 nm (the broad band center), 395 nm and 465 nm, respectively, the phosphor can be excited effectively by the UV LED and Blue LED. The emission spectrum excited by 395 nm showed a strong emission peak at 613 nm, originating from the 5D0→7F2 transition of Eu3+ ions. The Eu3+ ion concentration has great influence on the crystal parameters, the crystal symmetries and the luminescent properties. The influence of different concentrations of doped Eu3+ ions on the luminescent intensity of SrMoO4:Eu3+ was studied and the optimal doping concentration was found to be 15%. © 2011 Chinese Physical Society.


Zhao D.,Harbin Institute of Technology | Zhao D.,Suihua University | Zhang S.,Harbin Institute of Technology | Yin G.,Harbin Institute of Technology | And 3 more authors.
Journal of Power Sources | Year: 2012

In this study, Co-based selenides with various selenium contents have been synthesized by heating dodecacarbonyltetracobalt [Co 4(CO) 12] and elemental selenium in 1,6-hexanediol solvent under refluxing conditions. The synthesized catalyst powders are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The samples exhibit cauliflower-like surface morphologies and reveal the crystalline characteristics of orthorhombic CoSe 2 compound. Electrocatalytic performances of the Co-Se compounds for the oxygen reduction reaction in 0.5 M H 2SO 4 electrolyte are evaluated by rotating disk electrode (RDE). Co-Se catalysts are electrochemical stable in the potential range of 0.05-0.80 V (vs. NHE). The catalytic activity changes with increasing selenium content, and the highest activity is obtained at 67.1 mol% Se in the catalyst, which can be attributed to the modification of selenium element on the electronic structure of cobalt. © 2012 Elsevier B.V. All rights reserved.


Liu H.-Y.,Northeast Normal University | Liu H.-Y.,Suihua University | Wu H.,Northeast Normal University | Ma J.-F.,Northeast Normal University | And 3 more authors.
Crystal Growth and Design | Year: 2010

Six coordination polymers based on three related flexible bis-[(pyridyl)-benzimidazole] ligands and different carboxylates, namely, [Zn2(m-BDC)2(L1)]·2H2O (1), [Zn2(p-BDC)2(L1)(H2O)2] (2), [Zn2(m-BDC)2(L2)]·2.25H 2O (3), [Zn2(p-BDC)2(L2)] ·CH3OH (4), [Zn2(m-BDC)2(L 3)]·2H2O (5), and [Zn2(p-BDC) 2(L3)]·2CH3OH (6), where L1 = 1,1′-(1,4-butanediyl)bis[2-(2-pyridyl)benzimidazole], L2 = 1,1′-(1,6-hexanediyl)bis[2-(2-pyridyl)benzimidazole], L3 = 1,1′-(1,10-decanediyl)bis[2-(2-pyridyl)benzimidazole], m-BDC = m-benzenedicarboxylate anion, and p-BDC = p-benzenedicarboxylate anion, have been synthesized under solvothermal conditions. Their structures have been determined by single crystal X-ray diffraction analyses and further characterized by elemental analyses and infrared (IR) spectra. Compound 1 shows a one-dimensional (1D) double chain which extends into a two-dimensional (2D) supramolecular sheet by π-π interactions. Polymers 2-4 display similar 2D layer structures with 3-connected 63 topologies. In 2 and 3, the adjacent layers are further connected through π-π interactions to form three-dimensional (3D) supramolecular structures. However, in 4, two identical layers penetrate each other in parallel modes to give a 2-fold parallel interpenetrating net. Compounds 5 and 6 show 2-fold interpenetrating networks with α-Po topological structures. A systematic structural comparison of these complexes indicates that the different lengths of the bis-[(pyridyl)- benzimidazole] ligands (L1-L3) are important for the formation of the different structures. In addition, the luminescent properties of L1-L3 and 1-6 have been studied in the solid state at room temperature. © 2010 American Chemical Society.


Liu H.-Y.,Northeast Normal University | Liu H.-Y.,Suihua University | Yang J.,Northeast Normal University | Liu Y.-Y.,Northeast Normal University | Ma J.-F.,Northeast Normal University
Dalton Transactions | Year: 2012

Two novel inorganic-organic hybrid compounds based on octamolybdates, namely, [Cu(H2L)2(γ-Mo8O 26)]·(Mo6O19)·2H2O (1) and [Cu(H2L)(γ-Mo8O26)(H 2O)2]·5H2O (2), where L = 1,1′-(1,5-pentanediyl)bis[2-(4-pyridyl)benzimidazole], have been successfully synthesized at different pH values under hydrothermal conditions. Compound 1, which is hydrothermally prepared at pH ≈ 3.5, exhibits an entirely new type of intercalated layer. The nanosized hexamolybdate anions as guests are introduced into the layers. When the pH value is adjusted to 2, a structurally-different complex 2 was obtained. Compound 2 shows a unique 3D 4-connected framework constructed by inorganic layers and H2L 2+ ligands as bridges. The two compounds were characterized by elemental analyses, IR spectra and TGA. In addition, the electrochemical properties of 1-modified carbon paste electrode (CPE) have also been investigated in 1 M H2SO4 aqueous solution. © 2012 The Royal Society of Chemistry.


Liu H.-Y.,Northeast Normal University | Liu H.-Y.,Suihua University | Wu H.,Northeast Normal University | Yang J.,Northeast Normal University | And 3 more authors.
Crystal Growth and Design | Year: 2011

Four octamolybdate hybrid materials based on a new flexible multidentate ligand, namely, H4L(γ-Mo8O26) ·2H2O (1), [Cu(H2L)(β-Mo8O 26)(H2O)2]·3H2O (2), [Cu(H2L)(γ-Mo8O26)]·3H 2O (3), and Cu(HL)2(β-Mo8O26) (4), where L is 1,1′-(1,4-butanediyl)bis[2-(4-pyridyl)benzimidazole], have been synthesized at different pH values under hydrothermal conditions. Compound 1, which is hydrothermally prepared at pH ≈ 1, exhibits a rare one-dimensional (1D) molybdenum oxide chain. Compounds 2 and 3 are hydrothermally obtained at pH ≈ 2.5. In 2, CuII cations are bridged by H2L2+ ligands and (β-Mo8O 26)4- anions to form an interesting two-dimensional (2D) layer. In 3, the H2L2+ ligands and (γ-Mo 8O26)4- clusters bridge adjacent Cu II cations to form a 3D framwork. When the pH value is adjusted to 3.5, compound 4 is obtained. Because the HL+ cation acts as a monodentate ligand, compound 4 only exhibits a 1D chain structure. The structural diversities of 1-4 reveal that the pH value of the reaction system plays a crucial role in the assembly of POM-based metal-organic frameworks (MOFs). In addition, the electrochemical property of compound 4 has also been investigated in 1 M H2SO4 aqueous solution. © 2011 American Chemical Society.


Liu H.-Y.,Northeast Normal University | Liu H.-Y.,Suihua University | Wu H.,Northeast Normal University | Yang J.,Northeast Normal University | And 3 more authors.
Crystal Growth and Design | Year: 2011

Seven polyoxometalate (POM) hybrid materials based on Keggin polyanion building blocks and copper(I)-organic frameworks with pyrazine derivatives, namely, [CuI 4(2Et,3Me-Pyr)5(SiW 12O40)] (1), [CuI 4(2,6-Pyr) 4(SiW12O40)] (2), [CuI 4(2,5-Pyr)4(SiW12O40)(H 2O)2] (3), [CuI 4(2,3,5,6-Pyr) 4(SiW12O40)]-(H2O) (4), [Cu I 4(2,5-Pyr)4(PMoVI 11MoV O40)]·1.5H2O (5), [CuI 3(2,3,5-Pyr)4-(PMo12O 40)]·H2O (6), and [CuI 4(2Et,3Me-Pyr)5(PMoVI 11Mo V O40)] (7), where 2Et,3Me-Pyr = 2-ethyl-3-methylpyrazine, 2,6-Pyr = 2,6-dimethylpyrazine, 2,5-Pyr = 2,5-dimethylpyrazine, 2,3,5-Pyr = 2,3,5-trimethylpyrazine, and 2,3,5,6-Pyr = 2,3,5,6-tetramethylpyrazine, have been synthesized under solvothermal conditions. In 1 and 7, polyanions link CuI-organic sheets to generate 3D (3,4)-connected frameworks. In 2, the polyanion bridges CuI-organic chains to yield a 3D (3,4,6)-connected framework. Both 3 and 4 exhibit 2D double layer structures. In 5, the Keggin polyanion bridges the CuI-Pyr chains to form an infinite 3D (3,4)-connected framework. In 6, CuI cations are bridged by the 2,3,5-Pyr and Keggin polyanions to generate a novel 2D (8,3) sheet. The roles of the pyrazine derivatives and the Keggin polyanions in the formation of the POM-based MOFs have been discussed. © 2011 American Chemical Society.


Liu H.-Y.,Northeast Normal University | Liu H.-Y.,Suihua University | Bo L.,Northeast Normal University | Yang J.,Northeast Normal University | And 3 more authors.
Dalton Transactions | Year: 2011

Two novel hybrid materials based on two kinds of octamolybdate anions and metal-organic frameworks (MOFs), namely, [Ag 8(L 1) 4(α-Mo 8O 26)(β-Mo 8O 26)(H 2O) 3]·H 2O (1) and [Cu I 3.1Cu II 0.5(β-Mo 8O 26) 0.5(ζ-Mo 7 VIMo VO 26) 0.5(L 2) 2(H 0.8L 2) 0.5] (2), where L 1 = 1,1′-(1,3-propanediyl)bis[2-(4-pyridyl)benzimidazole] and L 2 = 1,1′-(1,4-butanediyl)bis[2-(3-pyridyl)benzimidazole], have been successfully synthesized. Crystal structure analysis revealed that 1 is a three-dimensional (3D) framework constructed of silver(i)-organic sheets and two types of (Mo 8O 26) 4- isomers. Compound 2 is a rare 3D framework containing copper(i,ii)-organic cages and 1D channels occupied by the (ζ-Mo 7 VIMo VO 26) 5- and (β-Mo 8O 26) 4- anions. The two compounds were characterized by elemental analysis, IR spectroscopy, diffuse reflectivity spectroscopy, and photoluminescent spectroscopy. In addition, the photocatalytic behavior of 1 was investigated. © 2011 The Royal Society of Chemistry.


Liu H.-Y.,Northeast Normal University | Liu H.-Y.,Suihua University | Wu H.,Northeast Normal University | Ma J.-F.,Northeast Normal University | And 3 more authors.
Dalton Transactions | Year: 2011

Six polyoxometalate-based (POM) hybrid materials based on octamolybdate building blocks and metal-organic fragments with flexible multidentate ligand, namely [CuII 2(ttb)2(β-Mo8O 26)(H2O)2]·2H2O (1), Cu I 4(ttb)2(β-Mo8O 26)(H2O) (2), [CuI 4(ttb) 3(β-Mo8O26)] (3), [Ni2(ttb) 2(β-Mo8O26)(H2O) 6]·2H2O (4), [Zn2(ttb) 2(α-Mo8O26)(H2O)2] (5), and [Ag4(ttb)2(β-Mo8O26)] (6), where ttb = 1,3,5-tris(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethyl benzene, have been synthesized under hydrothermal conditions. Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, TGA, IR spectra, and electrochemistry. Compounds 1 and 2 exhibit three-dimensional (3D) 2-fold interpenetrating frameworks with (3,6)-connected (41·62)(4 2·610·103) and (3,4)-connected (62·81)2(62·8 4) topologies, respectively. We are not aware of any other examples of interpenetrating (3,6)- and (3,4)-connected frameworks which involves the octamolybdates. Compound 3 shows a rare two-dimensional (2D) 2-fold interpenetrating network structure. In compound 4, a 3D supramolecular framework with the channels is constructed by the hydrogen-bonding interactions between (β-Mo8O26)4- polyanions and the Ni-ttb double layers, in which the guest (β-Mo8O26) 4- anions are included. If Zn⋯O interactions are considered, the structure of 5 is a 3D (3,4)-connected framework with (4·8 2)(4·82·103) topology. In 6, the ttb ligand as a tetradentate ligand links the Ag atoms to yield a 2D POM-based network. By careful inspection of the structures of 1-6, it can be seen that the ttb ligand, the metal ion and the coordination mode of the octamolybdate anion play important roles in the formation of the POM-based MOFs. © 2011 The Royal Society of Chemistry.


In recent years, the development of efficient artificial photocatalysts for CO2 reduction has attracted much attention; however, the product selectivity, catalyst stability and catalytic activity are far from the requirements for commercial consideration. Herein, we design and synthesis of ZnO nanorod arrays@carbon fiber (ZnO NA@CF) composites via an in situ controlled growth process. The as-prepared (ZnO NA@CF) composites exhibit exceedingly high activity and excellent selectivity in the photocatalytic reduction of CO2 to CH3OH (the maximum CH3OH yield is 430.2μmol gcat.-1 for 3.0h under UV light irradiation, which is 7.15 times as high as that on pure ZnO) as a result of the improved electron-hole pair separation rate on ZnO NA@CF interface, as well as high light harvesting effects derived from the NA@CF hierarchical structure. © 2016.


A new two-phase solution strategy has been developed for the synthesis of hybrid one-dimensional (1D) zinc oxide nanorod array@graphene (ZnO NA@graphene) nanostructures, in which ZnO NA@graphene were easily obtained at room temperature without using any catalysts, templates, or precursors. More importantly, an interesting formation mechanism of the 1D nanostructure in the benzene/water system and its distinctive morphology-controlling ability was discovered in this paper, respectively. Interestingly, the as-prepared ZnO nanorod@graphene composites exhibit exceedingly high activity and excellent selectivity in the photocatalytic reduction of CO2 to CH3OH (the maximum CH3OH yield is 375μmol gcat.-1 for 3.0h under UV light irradiation, which is 2.81 times as high as that on pure ZnO) as a result of the improved electron-hole pair separation rate on ZnO NA@graphene interface, as well as high light harvesting effects derived from the NA@graphene hierarchical structure. © 2016 Elsevier Ltd and Techna Group S.r.l.

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